Experimental Study of Behaviour of Reactive Powder Concrete Strengthening by NSM-CFRP Corbels

Abstract

The research contain an experimental examination for the behaviour of reactive powder concrete corbels, strengthened with varying orientation of Near Surface Mounted Carbon Fiber Reinforcement Polymers (CFRP) strips. Six reactive powder concrete corbels were tested. Divided into two groups, each group contain three specimens, one of them without strengthening takes as control corbel specimen, two corbels in each group strengthened by inclined and horizontal near surface mounted carbon fiber reinforced polymer (NSM-CFRP) stripes, other variable was the shear span to the effective depth ratio (a/d) to study the influences of those variables on the ultimate strength carrying capacity, cracking pattern, cracking load, vertical deflection, failure modes. The results showed an important improvement in the behaviour and load capacity of strengthened reinforced RPC corbels in addition to enhancing the stiffness of corbels. For group A where a/d =0.65, the percentages of increase in load failure were about (10.3% -15.45%) for inclined and horizontal strengthening respectively, and for group B where a/d =0.4, the percentages of increase in load failure were about (7.1% -14.6%) for inclined and horizontal strengthening respectively.

Behaviour of reinforced concrete corbels strengthened by FRP composites and steel bars: a critical review

“…It has also been discovered that the configuration of the repair has a substantial impact on the capacity of the NSM steel bars, whereas this impact was lower for externally bonded CFRP sheets because of the effectiveness of different material, as shown in figure 5. Another experimental study [12] was conducted to examine the behaviour of reactive powder concrete (RPC) corbels, strengthened by varying orientations (inclined and horizontal) of NSM carbon fibre reinforcement polymer (CFRP) strips. The findings demonstrated that the ultimate load and stiffness of strengthened reinforced RPC corbels were considerably improved and enhanced, compared with control specimens (without RPC).…”

“…Results have revealed that the strengthened specimens with inclined NSM-CRFP bars (45°) produced the greatest ultimate load capacity compared with other strengthening configurations. Furthermore, compared to control specimens, the use of NSM-CRFP bars increased maximum deflection and decreased width of crack at ultimate and service states.Another experimental study[12] was conducted to examine the behaviour of reactive powder concrete (RPC) corbels, strengthened by varying orientations (inclined and horizontal) of NSM carbon fibre reinforcement polymer (CFRP) strips. The findings demonstrated that the ultimate load and stiffness of strengthened reinforced RPC corbels were considerably improved and enhanced, compared with control specimens (without RPC).…”